Bolt-action firearm



Man. 27, 1-923, 1,449,650

F. F. BURTO ET AL BOLT ACTION FIREARM Filed May 14", 1921. 6sheets-shect l Mar. 27, 1923,

F. F. BURTON ET AL BOLT ACTION FIREARM Filed May 14, 1921.

6 sheetsshect 2 Mar. 27, 1923,

F. F. BURTON ET AL BOLT ACTION FIREARM Filed May 14, 1921.

6 sheets-sheet Mar. 27, 1923,

BURTO BOLT ACTION Filed May 14 .w Mi 3 ll A M S g g \& $1 m w Rh xiv v Qs 3 \w Mar. 27,.1923.

F. F. BURTON-ET AL BOLT ACTION FIREARM Mar. 27, 1923,

F. F. BURTON ET AL -'BOLT ACTION FIREARM Filed May 14, 1921. 6sheets-sheet 6 Patented Mar. 27, 1923.

FRANK F. BURTON, or MOUNT CAR-MEL, AND ARTHUR A. RowLEY, or WHITNEY-VILLE, CONNECTICUT, ASSIGNORS To w Cnns nR RPEATING ARMS 00., or NEWHAVEN, CONNECTICUT, a CORPORATION.

BOLT-ACTION FIREARM.

Application filed. May 14,1921. Serial No.69,541.

To all whom it may concem:

Be it known that we, FRArJN F; Bonron and ARTHUR A. Rownnr, citizensv ofthe United States, residing. respectively, at lv'iount Carmel and at Whitneyville, in the county of New Haven and State of Connecticut, haveinvented a new and useful Improvement in Bolt-Action Firearms; and we dohereby declare the following. when taken in connection with theaccompanying drawings and the characters of reference marked thereon, tohe a full, clear, and exact descrip-.

tion of the same, and which said drawings constitute part of thisapplication, and represent, in-

Fig. 1 a view in right hand side elevation of a bolt-action firearmembodying our in vention.

Fig. 2 an enlarged broken view thereof in right hand side elevation.

3 an enlarged broken view in right hand side elevation of the receiverand learrel unit with the attached magazine holder,

and with the action partly open.

Fig. a similar view of the stock unit.

Fig. 5 a view corresponding to Fig. 2 partly in vertical centrallongitudinal section on the line of Fig. 6.

Fig. 6 a plan view corresponding to Fig;

2 partly in horizontal section on the line 6tl of Fig. 2.

Fig. 7 a view corresponding to F lg. 5 with the magazine removed, themagazine holder not in section and the gun cocked.

8 a view in transverse section on the Fig. 15 a similar plan view of theboltunit.

16 a similar view thereof in right hand side elevation with the handlelifted part way.

Fig. 17 a similar reverse plan view thereof.

Fig. 18 a similar plan view thereof with the firing pin head.

Fig. 22 a similar view thereof in side elevation.

Fig. 23 a similar view thereof in front end elevation. Fig. 24: adetached enlarged plan view of the firing pin body.

Fig. 25 a similar view thereof in side elevation.

Fig. 26 a similar view thereof in front end elevation. I

27 a detached enlarged plan view of the 'bolt sleeve. i

F 28 a similar view thereof in side elevation. i

Fig. 29 a similar view thereof in rear end elevation.

Fig. 30 aidetachcd enlarged plan view of the bolt.

Fig. 31 asimilar view thereof in side elevation.

Fig. 32 a similar view thereof in front end elevation. I

Fig. a similar view in side elevation of the firing-pin point.

Fig. 34: a similar view thereof in rear end elevation.

Fig.35 similar view in perspective of the left hand extractor.

Fig. 36 a detached enlarged plan view of' Fig. 42 a similar plan view ofthe elevation nut spring.

Fig. 43 a similar view thereof in rear elevation;

Fig. 44 a detached enlarged view in longitudinal elevation of theoperating handle.

Fig. a5 a detached enlarged view in per spective of the magazine filler.

Our invention relates to an improvement in bolt-action box-magazinefirearms of the class having a non-rotatable longitudinally slidablebreech-bolt and a rotatable locking-sleeve and handle thereon, theobject being to produce a firearm of the class described constructedwith special reference to simplicity f manufacture, safety in use,accuracy and ease of operation.

lVith these ends in view our invention consists in a firearm of theclass described characterized by certain details of construction andcombinations of parts as will be hereinafter described and pointed outin the claims.

In carrying out our invention as herein shown, we construct a firearmhaving a two-piece firing-pin comprising a body 46 and a point 47. Thebody 46 is cylindrical and is provided at its forward end with anintegral seniicylindrical, forwardly projecting, coupling-extension Q8.The point 47 comprises a short,. substantially cylindrical body 49 and aforwardly projecting striker 50. The point body t9 has on its rear facean integral rearwardly' projecting cylindrical coupling extension 51formed at its base with a circumferential groove 52. The flat face ofthe body extension 48 is provided with two concentric communicatingsemicylindrical cuts forming a recess 53 adapted t receive the extension51 and thus couple the point 47 rotatably to the body 46. The rearportion of the striker 50 is of rectangular cross-section, taperingforwardly to the cylindrical front portion thereof. The body 49 of thepoint 47 is formed with a transverse sear-notch 54 and shoulders forlimiting its forward travel.

The firing pin body 46 has a cylindrical bore 56 extendinglongitudinally forward from its rear end nearly its entire length,within which is housed the helical main spring 57 with its forward endabutting against the front wall of the bore 56 and its rear end againsta transverse pin 58 which passes through two diametrally locatedlongitudinal slots 59 in the rear portion of the body 46. Each of theslots 59 is intersected at the front end of its left hand side by alateral detent slot 60, the pin 58 and the slots 59 and 60 being soarranged that when the firing pin body is retracted against the tensionof the spring 57 and reaches its rearmost position relative to the pin58 it may be rotated to the right whereby the pin '58 will enter thedetent slots 60 and will be held there against accidental dislocation byprojections 61 located between the slots 59 and the slots 60.

Upon the rear end of the body 46 is mounted a forwardly open,substantially cylindrical hollow head 62 terminating at its rear end ina peripherally knurled grip 63 and having its forward edge provided witha pair of integral forwardly projecting, diametrally located teeth 64;.The head 62 is fastened to the body d6 by means of a transverse pm 65.

The main spring abutment pin 58 is mounted transversely in the rear end.of the breech bolt 66 within which the firing pin is housed in acombined bore and slot 67 which conforms to the external contour of thefiring pin and is so located and oriented that in its extreme forward psition the point of the striker 50 is flush with the flat extremeforward surface 68 of the bolt. The point a? of the firing pin is,prevented from rotating relative to the bolt by the engagement of therectangular rear portion of the striker 50 with the walls of thecorresponding conformable portion of the bore 67.

The breech bolt 66 comprises a front portion 69 which is in externalform a cylinder of which a little less than half is cut away t form afiat bottom face 70 intersecting the middle portion of the com binedbore and slot 67 and thus exposing the rear portion of the firing pinpoint which bears the sear notch 5a thereof. At the forward end of theface 70 is a centrally located. longitudinal, depending loading lug 71and immediately to the left thereof the longitudinal ejector clearancegroove 72. Just above the face 70 intersecting the front face 68 and thecylindrical outer surface of the bolt-body are the two diametrallylocated, longitudinal. extractor slots 73. In the front face 66 of thebreech bolt is a cartridge head receiving recess 74;, intersected by theforward end of the bore 67 and communicating with the left handextractor slot 73 by a short transverse slot- 75 (Fig. 32). Each of theextractors is mounted in its respective slot on a vertical pivot 76passing through a correspondiinr hole 77 about midway of the length ofthe extractor. Each extractor consists of fiat piece of metal having along; slightly curved uter face and a strongly triply curved inner faceforming between them slender front and rear extensions and a broadcentral portion in which is lo ated the hole 77.

The front extension of the right hand ezv tractor 78 is provided with ahook-like head 79 of approximately double the thickness of the rest ofthe extractor. the rear face of which justclears the front face 66 ofthe breech bolt and overhangs the cartridge head recess 74 thereof. Thefront extension of the left hand extractor 80 is provided with ahook-like head 81 which rests in the slot 75 in the front end of thebreech-bolt and is notched at its inner corner as at 82 to grip the rimof acartridge head located in the recess 74;. In each of the slots 73near the rear thereof is a recess 83 in which is located a helicalextractor-actuatingspring 84: which tends to push the rear end of theextractor outward and hence holds the extractor heads yieldingly againsta cartridge head lying between them.

V The rear portion 85 of the breech bolt is acylinder integral andcoaxial with the front portion 69 butof less diameter sothat arearwardly facingsemi-annular shoulder 86 is formed between them. Thebore 67 extends throughout the rear portion 85 and houses the firing pinbody a6. Near the extreme rear end are a pair of diametral transverseholes 87 to receive the main spring abutment pin 58. Near, the front endof the rear portion 85 of the breech bolt is a segmental slot 88. i

' Upon the cylindrical outer surface of the rear portion 85 of thebreech bolt and abutting with its forward end against the shoulder 86 isrotatably mounted a sleeve 89 .the rear edge of which formed with a pairof safety cam notches90 corresponding to the teeth 6 1 of the firing pinhead and coacting therewith, when the sleeve is rotated, to force thefiring pin rearward against the tension of the main spring and thus towithdraw the nose of the firing pin withinthe u breech bolt and out ofpossible contact with any cartridge. The rear edge of the sleeve 89 isalso provided with a pair of detent notches 91 similar to but shallowerthan the notches 90 wherewith the teeth coact in another position of thesleeve 89 to retain the same yieldingly in position. The for: ward outersurface of the sleeve is cut away to form a flat combined clearanceand'cam surface 92 and a longitudinal locking groove 93. 5

The sleeve .89 is also formed at, its forward end with an integral,radially extending, bolt-locking stud 9st havinga central radialthreaded bore 95 which receives the,

threaded inner end of a radially positioned operating handle 96, theextreme inner end of which 18 provided with a cvl ndrical stud 9]"fitting into the slot 88 of the breech-bolt whereby the handle 96 andsleeve 89 are.

pr evented from longitudinal and permitted rotary motion relative to thebolt.

The breech-bolt unit as described consist? ing of the breechbolt, firingpinhfiring pin head, sleeve and handle, is mounted inra receiver98which, as herein shownthoughnot so limited, is.an integral, rearwardextension of thebarrel 99'.

. .1The receiver98is cutaway for about the:

forward half of its length above a horizontal plane lying a trifie'belowthe axis of the receiver to form a loading and ejection opening 100which intersects at its forward lower corners a pair ,of extractorclearance s10ts 101 formed inthe rear endofthe bar rel adjacent to thecartridge chamber 102 thereof for the receptionof the heads oftheextractors 78 and 80 when the bolt is closed.

The receiver isfortned internally to conforinto the external surface ofthe bolt unit,- the rear portion of the receiver having a cylindricalbore 103, within whichthe firing pin head 62, the sleeve 89 and the rearend of the forward portion 69 of the breech bolt, which are all of.substantially like, diameter, are housed when the bolt is closed-and-the front portion of the receiver having a flat upper surface 10 1forming a guide for the bolt, and preventing rotation of the samebycontact with the flat bottom face/('0 thereof,

The rear portion of the receiver is further provided on its right handside with a vertical-bolt locking slot 105, aihorizontal guidewayslot106 and connecting these an arcuate priimary-eXtract-ion-cam slot 107 inwhich,

the stud 94 of the sleeve 89v travels, being turned down int-o the, slot105 to lock the closed bolt, beingturne'd up through .the cam slot 107to withdraw the bolt-power fully a short distance thus starting the,shell of a discharged cartridge from the chamber, and being withdrawnalong the slot 106 to open the bolt or to withdrawthe bolt from the gun,asthe slot 106 intersects the ex treme rear face ofthe receiver. 1 H

In the outer surface of the receiver wall is cut a longitudinal, groove108 located about, 45 .up ,from the bottom line of the receiver andterminating at its rea'rend in a slot 109 passing radially through thewall,

of the receiver. A wirespring 110 is rigidly held in the grooveby..forcing in a portion of the walls of the groove upon it. The rearend of thewire is formed into an are 111 the crest. of which projectsthrough the,,.

slot 109 into the;bore 103 of the receiver forming a yieldingbolt-handle lock.

Vhen the breech bolt is closed by pushing the handle forward so that thestud 9t moves to the forward. end .of the slot 106,,

the flat combined clearance andcanisurface 92 of the sleeve 89, engagesthe arc 111.; and upon the-stud 94 being turned downward through theslot107 by rotating the sleeve,

the spring are 111 .is. .push edv outwardly and .The front portion of.thei receivei is pierced vertically by the rectangular magazine welll12which communicateswith and forms a continuation of the magazine chamberof the box-like magazine holder 113 yieldingly locking the sleeve in;

which is attached to the under side of the receiver by means of screws114 and 115 passing through horizontal lugs 116 and 117 formed at thetop of the front and rear walls respectively of the magazine holder andseated in corresponding recesses 118 out in the under surface of thereceiver and barrel adjacent to the well 112. The front screw 114 isscrewed into a threaded hole 119 in the bottom of the barrel 99. Therear screw 115 passes through a hole 120 in the bottom of a rectangularslot 121 interposed between the well 112 and the bore 103, and isscrewed into a threaded hole 122 in the bottom of an ejector block 123positioned in and completely filling the slot 121. On the upper surfaceof the block 123 is the lug-like upstanding ejector 124 which is-housedin the ejector clearance groove 72 in the under face of the bolt and isuncovered by the bolt when the same has nearly reached the rearwardlimit of its excursion.

In the chamber of the magazine holder 113 is positioned a box magazinesuch as is described in United States Patent #1323,- 063 to Thomas C.Johnson and Frederick L. Humiston, or such as is described in UnitedStates Patent #1.331,155 to Thomas C. Johnson with the additionalfeature of being provided when desired with. a shorter follower and withthe hollow, sheet-metal, segmental filler 125 which is rigidly fastenedinto the magazine by soldering, riveting, welding or in some equivalentway. By this construction we are enabled in a very simple manner toadapt different specimens of one style and external size of box magazineto hold and deliver satisfactorily cartridges of different lengths.

The magazine holder comprises end walls which are bent forwardly andrearwardly respectively to form the attachment lugs 116 and 117 and areeach formed on their inner side with a central longitudinal rib, leavingclearance grooves for the projecting edges'of the side walls of themagazine. The material of .the right hand side wall 126 of the magazineholder is forced out to form a clearance channel 128 to permit the stop129 of the magazine to pass when the latter is inserted. As the magazineis pushed into position, the stop rides over a combined cam and catch130 formed in a flat spring 131 riveted at its forward end to the sidewall 126 of the magazine holder. As the stop passes the cam the lattersnaps back under it. holding the magazine in place until it is releasedby a push on the rear end of the spring 131 which extends beyond therear wall of the holder, when the magazine may be withdrawn.

The front and rear walls of the magazine holder 113 are rigidly attachedto the side walls thereof by means of integral lugs 132 projecting fromthe lateral edges of the end walls, entering corresponding slots nearthe front and rear edges of the side walls and being riveted downthereupon. Upon the bottom end of the magazine holder is rigidly mountedan elongated cup-like bottom piece 133 having its floor perforated toadmit the magazine and having its outside bottom corners and edgesrounded to prevent damage as they project from the stock of the arm. Therounded outer contour of the bottom piece of the depending magazineholder guides the holder in the corresponding aperture of the stock whenthe gun is being assembled after being taken down and prevents theholder from jamming therein.

The combined receiver and barrel are mounted in a one-piece stock andforearm 134 having a longitudinal groove 135 in the upper surfacethereof for the reception of the barrel and receiver. In the under sideof the barrel is an undercut transverse dovetail groove 136 in which ismounted a block 137 correspondingly formed at its upper end and providedat its lower end with a vertical internally threaded hole 138 for thereception of a take-down screw 139 mounted in the stock. The block 137is further provided at its bottom end with an integral rearwardlyextending lug 140. In the bottom of the groove 135 of the stock is arecess 141 for the reception of the block 137. The takedown screw 139 ismounted loosely in a bushing 142 which is rigidly mounted in the floorof the recess 141. The said recess is undercut as at 143 to receive thelug and the parts are so proportioned and arranged that after the screw139 has been withdrawn from the hole 138 the barrel and receiver must bemoved bodily forward relative to the stock to free the lug 140 from theunder cut 143 before the gun can be taken down by lifting the block 137from the recess 141. This becomes a safety feature of the aim incombination with the fact that a recess 144 is provided in the wall ofthe groove 135 to receive the bolt handle 96 when the gun is closed thuspreventing the forward movement of the receiver relative to the stockunless the bolt is open, so that the gun cannot be taken down unless thefiring pin nose is retracted within the bolt and the gun is uncocked. i

A rectangular aperture 145 in the stock provides space for the magazineholder and magazine which pass through the stock and. protrude from thebottom thereof. The magazine catch actuating button 146 is mounted bymeans of a long stem 147 in a bushing 148 rigidly mounted in atransverse hole 149 bored through the left hand wall of a recess in thestock comunicating with the rear end of the magazine holder aper ture14:5 and providing clearance for the magazine catch spring 131. Thebutton 146 is kept from falling out by a spring'retai'ri ing ring 150mounted in a groove 151 en'- circling the stem.

The'trigger 152 having a spring 152 and an integral sear arm 153 ispivotally mounted in a slot 154: in the stock by means ofa transversepin 155. Near the forward end of the sear arm 153 is an upstandingcombined sear and bolt stop '156 the rear upper corner of which istransversely notched to form the rearwardly facing sear nose/157 whichcoacts with the forwardly facing rear wall of the sear notch 54 of thefiring pin 45 to cock the gun when the bolt is moved forward. The frontupper corner of the combined sea-r and bolt stop 156 coacts with therear face of the loading lug 71 of the bolt to prevent withdrawal of thelatter from the gun unless the trigger be held back. When the gun istaken down,the trigger and sear are removed from the receiver togetherwith the stock and means must be provided to keep the bolt from comingout of the receiver unless purposely removed therefrom.

To this end, the left hand extractor'80 is provided on the outer surfaceof its rear extension with a detent-cam 158 and a shallow recess 159 isformed in the inner surface of the left hand receiver wall. The rearface of the cam 158and the rear face 160 of the recess 159 slope asshown. When the bolt is drawn rearwardly past the'pos'ition in which itis ordinarily stopped by the stop 156, it is stopped by the contact orcam 158 with the rear face 160 of the recess 159 but a slight jerk o,the bolt will cause the face 160 to ride the cam down against thetension of the extractor spring Sathu's liberating the bolt.

A transverse undercut slot 161 is formed in the upper surface of thereceiver the rear of the loading and'ejection opening in which ismounted a rear sight.

' sight as herein shown consists of a rear sight frame comprising ahorizontal" body 163 formed at each end with an'integral, up standing,sight-slide-guide lug 165. he body 163 is further formed at the bottomthereof with a transverse dovetail 164 adapted to fit tightly into theslot 161 of thereceiver.

Each of the lugs 165 is formed on its inner face with a vertical groove166 for the reception of a vertically adjustableslide 167 positioned inand guided by the grooves 166. The slide 167 is provided with a sightingaperture 168 in its upper portion while'its lower part is formed with ascrew thread 169 which enters the complementary female thread 170 of theknurled elevation nut 171 which is housed in a pair of horizontal slots172 opening out of the bottom of the space between the lugs 165 and isheld against vertical displacement by thewalls of the said slots andagainst longitudinal displacement bythe'slide 167 which it surrounds.

'The central perforation of the nut 171 is counterbored at its lower endas at 173 to receive an annular spring 17 1 provided with a p'a-inofdiametrically opposite external lugs1'75 which fit int'o'the respectiveends of ayertieally disposed slot 176 in the body 163' whicli' alsoprovides clearance for the bottolin end of the slide 167 when the latteris in its lowest position. "The spring 1741s curved upwardly into anarch having the lugs1'l as abutmeiits and midway between them is'formedwith'a pair of small upward bows 17S which coact-with notches 179arranged in diametral pairs in the bottom face'o'f the 1'1ut'171 wherebythe latter is yieldingly held againstaccidental rotation and at the sametime a click is provided whereby' the vertical adjustment of the slidemay be gauged by sound or feeling. if

Thespeci'fic box-magazine herein shown and described is not hereinclaimed, but is made the subject of a separate application filed Nov. 3,1921, Serial No. 512,622.

The specific rear-sight herein shown and described is notherein'claimed, but is made the subject ofaseparate application filedNov. 3, "19 21,"Serial No. 512,623.

W sla n 1. In abblt -action, take-down firearm, the combinatien'with'astock-unit organized to behandled one piece and comp-rising a stoclrfa asear, of a receiveralso organized to be handled as one .U c ivv-..- .,iii piece and comprising a receiver, a barrel e p e aratsad n e t v' with' pairs of interlocking locking-members, ofwhichone pairispo'sitionedto co-o-perate the b'reech bolt to'ho'ld both pairs oflocking meniber s in locking-engagement when"" he breech-bolt is closedand locked."

"2. In a bolt-action, take-down firearm, the combination withafstock-unit organized to be handled as one piece and comprising astock, a trigger and a sear; of a receiveralso e'rgiinized to be handledas one piece and comprising a receiver, a barrel and a breeeh-beltfthesaid units being respectively provided with interlockinglockin'g-meinersand 'relatively movable longitudinally for being locked and unlocked,andthe" said locking members being controlled bythe said breech-bolt,which, when in its closed and locked position, coacts with the saidstocktdprevent the longitudinal movement of "the units in the directionof unlecking.

"3'. Ina bolt-action, take-down firearm, the combination with astock-unit organized to be handled as one piece and comprising a stock,a trigger and a sear; of a receiverunit also organized to be handled asone piece and comprising a receiver, a barrel and a breech-bolt, thesaid units being respectively provided with elements of locking meanspreventing their separation when the breech-bolt is closed and locked,and the said means including a block depending from the receiver-unitand having a. rearwardly-projecting lug coacting with an under-cutrecess in the stock-unit, and also including a handle on the breech-boltcoacting with a notch in the said stock.

4. In a bolt-action, take-down firearm, the combination with astoclcunit organized to be handled as one piece and comprising a stock,a trigger and a sear, and the said stock being provided with an undercutrecess and with a laterally-opening locking-notch located to the rearthereof; of a receiver-unit organized to be handled as one piece andcomprising a. receiver, a barrel integral therewith, a bolt having ahandle, and a block depending from the said barrel and formed with arearward projection which enters the undercut of the said recess in thestock to prevent the separation of the stock and barrel except'after therelative longitudinal displacement of the two units, which must bepreceded by the disengagement of the handle from the notch in the stock,whereby the said block, recess, bolt-handle and notch prevent the twoseparately organized units from being taken apart when the gun is cockedand in condition to shoot.

5. A firearm having a receiver; a box-like magazine holder attachedthereto, open at the top and comprising forwardly curved front and rearwalls, substantially flat side walls rigidly attached thereto, one ofthe said side walls having a perforated magazine-stop clearance-channel,and an elongated cup shaped bottom-piece having rounded bottom edges andcorners rigidly attached to the said side walls, a magazine removablylocated in the said holder and having a stop positioned in the saidchannel; and a combined magazine-catch and spring mounted upon the saidmagazine-holder and coacting with the said stop throughthe perforationin the wall of the said channel to retain the said magazine removably inplace.

6. In a take-down bolt-action box-magazine firearm, the combination witha receiver having rigidly attached thereto a barrel, and a box-likemagazine-holder open at the top and at the bottom and provided with arigidly attached bottom guard comprising an upturned, sheet-metal collarhaving rounded corners and edges; of a stock adapted to be detachabl'ysecured to the said barrel and having a recess for the reception of thesaid magazine-holder which is guided into the said recess by the roundedcorners and edges of its guard.

7. In a bolt-action firearm, the combination with a non-rotatable boltof a sleeve rotatably mounted thereupon; and a separately formed handlerigidly mounted in the said sleeve and having means adapted to coactwith the said bolt to prevent relative longitudinal motion of the boltand the sleeve and to permit partial relative rotation thereof.

8. In a bolt-action firearm, the combination with a receiver of anon-rotatable bolt mounted therein; a sleeve rotatably mounted on thesaid bolt and having an integral locking-stud adapted to coact with thesaid receiver to lock and unlock the said bolt thereinupon rotation ofthe said sleeve; and a combined operating-handle and sleeve and-boltcoupling mounted on the said sleeve and adpated to coact with the saidbolt to prevent longitudinal and to permit rotational relative motion ofthe said bolt and: sleeve.

9. In a bolt-action firearm, the combination with areceiver of a bolthoused therein; a firing-pin housed in the said bolt and comprising arear portion and a front portion coupled for a relative rotationalmotion, the said. front portion being provided with a striker and a searnotch; a main spring housed in the said rear portion of the firingpin;and sear-and-trigger mechanism adapted to coact with the said sear-notchin the front portion of the firing pin.

10. In a bolt-action firearm, the combination with a two part firing-pincomprising a front portion and a rear portion coupled for relativerotation; of a sear-notch formed in the saidfront portion; and means forhousing and operating the said firing-pin, including a sear for coactionwith the said sear-notch.

11. In a bolt-action firearm, the combination with a barrel of areceiver integral therewith, formed with an integral flat toppedbolt-guide, a bolt housed in the said receiver, having a longitudinalbore, and having its forward portion cut away to eX- pose a portion ofthe said bore and to adapt the said bolt to coact with the said boltguide to prevent the bolt from rotating; a bolt-operating handlerotatably mounted upon the said bolt and coacting with the said receiverto lock and unlock the said bolt; a firing-pin housed in the said boreand comprising a front portion having a striker and a sear-notch and arear portion rotatably coupled to the said front portion which is heldagainst rotation by the walls of the said bore, a main spring housedwith in the said rear portion; a head mounted upon the said rear portionfor the manipulation of the firing-pin; and sear-ancltrigger mechanismadapted to coact with the said sear-notch and being given access thereto through the said cutting away of the bolt.

12. In a bolt action firearm, the combina- 1 tion with a receiver of abolt non-rotatably mownted therein; a hollow firing-pin mounted in thesaid bolt and having its side Walls formed with longitudinal slotsprovided at their forward ends with lateral notches, a main springhoused in the rear portion of the said firing-pin, abutting at itsforward end against the said firing-pin, and an abutment-pintransversely mounted in the said bolt, passing through the saidlongitudinal slots in the side walls of the said firing-pin andpositioned in the rear end of the said bolt, whereby when the saidfiring-pin is retracted longitudinally against the tension of the saidmain spring it may be rotated until the said abutment-pin enters thesaid lateral notches and thus prevents the forward motion of the saidpin.

13. In a bolt-action firearm, the combination with a receiver having inone of its side walls a longitudinal groove which terminates at one endin a slot extending transversely through the said wall; of asubstantially cylindrical bolt-unit mounted in the said receiver forlongitudinal motion therein and having a cylindrical member rotatablefor locking and unlocking the bolt, the said member having alongitudinal groove therein; and a spring detent comprising a straightportion by which it is mounted in the said groove in the receiver and acurved portion which extends through the said transverse slot in thereceiver to coact with the groove in the rotatable member of thebolt-unit to hold the same yieldingly in the bolt-locking positionthereof.

In testimony whereof, we have signed this specification in the presenceof two subscril ing witnesses.

FRANK F. BURTON. ARTHUR A. ROWLEY.

Witnesses:

ERIK S. PALMER, AMos DICKERMAN.

